Equal volumes of acid and base are mixed, but the solution remains basic. What is the most likely reason?
Answer and explanation
Correct answer: The base supplied more effective hydroxide ions
Equal volume does not mean equal chemical amount. The base may have a higher concentration, may be stronger, or may provide more moles of effective OH⁻ than the acid provides moles of H⁺. After neutralisation, excess OH⁻ remains, making the mixture basic. Neutralisation does occur, but it may be incomplete with respect to the base. Thus A is correct; the other statements are chemically false.
Frequently asked questions
What is the correct answer to this question?
The base supplied more effective hydroxide ions
Why is this the correct answer?
Equal volume does not mean equal chemical amount. The base may have a higher concentration, may be stronger, or may provide more moles of effective OH⁻ than the acid provides moles of H⁺. After neutralisation, excess OH⁻ remains, making the mixture basic. Neutralisation does occur, but it may be incomplete with respect to the base. Thus A is correct; the other statements are chemically false.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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